Description

Oenothera biennis, commonly known as evening primrose, is a flowering plant in the Onagraceae family. It is valued for its seeds, which are used to produce oil rich in essential fatty acids, particularly gamma-linolenic acid (GLA). The plant is utilized in various applications, including cosmetics, personal care products, and nutritional supplements, for its therapeutic benefits.

Chemical Composition and Structure

Oenothera biennis contains several important bioactive compounds, including:

Gamma-Linolenic Acid (GLA): This essential fatty acid is prominent in the seeds and is known for its anti-inflammatory and skin-conditioning effects.
Linoleic Acid: An essential fatty acid that helps maintain skin barrier function and hydration.
Flavonoids: Present in the flowers and leaves, these compounds have antioxidant and anti-inflammatory properties.
Tannins: Found in the leaves and flowers, tannins provide astringent and protective benefits.
Saponins: These compounds contribute to the extract’s soothing and cleansing properties.
The plant’s chemical structure is characterized by a rich profile of fatty acids and other active compounds that contribute to its health benefits.

Physical Properties

Oenothera biennis is characterized by:

Appearance: The plant has striking yellow flowers, and its seeds are small and oily. The oil extracted from the seeds is usually a pale yellow liquid.
Aroma: The plant and its oil have a subtle, herbal fragrance.
Texture: The oil has a smooth, slightly viscous texture and is easily absorbed by the skin.

Production Process

The production of Oenothera biennis products involves the following steps:

Cultivation: Oenothera biennis is cultivated in various regions, and the plant is grown for its seeds, which are rich in beneficial oils and compounds.

Harvesting: Seeds are collected once they are mature. The flowers and other plant parts can also be harvested for different uses.

Preparation: The harvested seeds, flowers, and other plant parts are cleaned and prepared for extraction. This involves removing impurities and ensuring the material is ready for processing.

Extraction:

Cold Pressing: Seeds are mechanically pressed to extract oil without the use of heat, preserving the integrity of the fatty acids and other sensitive compounds.
Solvent Extraction: In some cases, solvents such as ethanol or hexane are used to extract the oil from the seeds, followed by purification to remove any residual solvents.
Purification and Refinement: The extracted oil is refined to remove impurities and improve stability. This may include filtering, deodorizing, and bleaching to ensure a high-quality product.

Formulation: The purified oil or extract is formulated into various products, including cosmetics, supplements, and personal care items. It is mixed with other ingredients to create the final products.

Quality Control: Rigorous testing is conducted to ensure the final product meets safety, efficacy, and quality standards. This includes checking for purity, stability, and compliance with regulations.

Storage: The finished product is stored in airtight, light-resistant containers to maintain its quality and extend shelf life.

Applications

Medical: Oenothera biennis oil is used in dietary supplements for its health benefits, including support for skin health and inflammatory conditions. GLA, in particular, is known for its potential to support cardiovascular health and reduce inflammation.

Cosmetics: In cosmetics, Oenothera biennis oil is valued for its moisturizing, anti-inflammatory, and antioxidant properties. It is incorporated into products such as creams, lotions, and serums to enhance skin hydration, elasticity, and overall appearance.

Other: The plant and its extracts may also be used in other therapeutic and personal care products, including herbal remedies and natural health products.

Environmental and Safety Considerations

Oenothera biennis is generally considered safe for use in cosmetics and health products when used as directed. The plant is natural and has a low risk of adverse reactions. Sustainable cultivation and extraction practices help to minimize environmental impact and ensure the responsible use of resources. Care should be taken to follow guidelines for quality control to avoid contamination and ensure product safety.

INCI


Skin conditioning agent. It is the mainstay of topical skin treatment as it has the function of restoring, increasing or improving skin tolerance to external factors, including melanocyte tolerance. The most important function of the conditioning agent is to prevent skin dehydration, but the subject is rather complex and involves emollients and humectants that can be added in the formulation.
Synonyms:

CAS: 90028-66-3 EC number 289-859-2